Kconfig 4.4 KB
Newer Older
1 2 3
#
# Architectures that offer an FTRACE implementation should select HAVE_FTRACE:
#
4 5 6 7

config NOP_TRACER
	bool

8 9
config HAVE_FTRACE
	bool
10
	select NOP_TRACER
11

12 13 14
config HAVE_DYNAMIC_FTRACE
	bool

15 16 17
config HAVE_FTRACE_MCOUNT_RECORD
	bool

18 19 20
config TRACER_MAX_TRACE
	bool

21 22 23
config TRACING
	bool
	select DEBUG_FS
I
Ingo Molnar 已提交
24
	select STACKTRACE
25
	select TRACEPOINTS
26

S
Steven Rostedt 已提交
27 28
config FTRACE
	bool "Kernel Function Tracer"
29
	depends on HAVE_FTRACE
30
	depends on DEBUG_KERNEL
S
Steven Rostedt 已提交
31 32
	select FRAME_POINTER
	select TRACING
33
	select CONTEXT_SWITCH_TRACER
S
Steven Rostedt 已提交
34 35 36 37 38 39 40 41
	help
	  Enable the kernel to trace every kernel function. This is done
	  by using a compiler feature to insert a small, 5-byte No-Operation
	  instruction to the beginning of every kernel function, which NOP
	  sequence is then dynamically patched into a tracer call when
	  tracing is enabled by the administrator. If it's runtime disabled
	  (the bootup default), then the overhead of the instructions is very
	  small and not measurable even in micro-benchmarks.
42

43 44 45 46 47
config IRQSOFF_TRACER
	bool "Interrupts-off Latency Tracer"
	default n
	depends on TRACE_IRQFLAGS_SUPPORT
	depends on GENERIC_TIME
48
	depends on HAVE_FTRACE
49
	depends on DEBUG_KERNEL
50 51 52 53 54 55 56 57 58 59 60 61 62
	select TRACE_IRQFLAGS
	select TRACING
	select TRACER_MAX_TRACE
	help
	  This option measures the time spent in irqs-off critical
	  sections, with microsecond accuracy.

	  The default measurement method is a maximum search, which is
	  disabled by default and can be runtime (re-)started
	  via:

	      echo 0 > /debugfs/tracing/tracing_max_latency

63 64 65 66 67 68 69 70 71
	  (Note that kernel size and overhead increases with this option
	  enabled. This option and the preempt-off timing option can be
	  used together or separately.)

config PREEMPT_TRACER
	bool "Preemption-off Latency Tracer"
	default n
	depends on GENERIC_TIME
	depends on PREEMPT
72
	depends on HAVE_FTRACE
73
	depends on DEBUG_KERNEL
74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89
	select TRACING
	select TRACER_MAX_TRACE
	help
	  This option measures the time spent in preemption off critical
	  sections, with microsecond accuracy.

	  The default measurement method is a maximum search, which is
	  disabled by default and can be runtime (re-)started
	  via:

	      echo 0 > /debugfs/tracing/tracing_max_latency

	  (Note that kernel size and overhead increases with this option
	  enabled. This option and the irqs-off timing option can be
	  used together or separately.)

I
Ingo Molnar 已提交
90 91
config SYSPROF_TRACER
	bool "Sysprof Tracer"
T
Thomas Gleixner 已提交
92
	depends on X86
I
Ingo Molnar 已提交
93 94 95 96 97
	select TRACING
	help
	  This tracer provides the trace needed by the 'Sysprof' userspace
	  tool.

98 99
config SCHED_TRACER
	bool "Scheduling Latency Tracer"
100
	depends on HAVE_FTRACE
101
	depends on DEBUG_KERNEL
102 103 104 105 106 107 108
	select TRACING
	select CONTEXT_SWITCH_TRACER
	select TRACER_MAX_TRACE
	help
	  This tracer tracks the latency of the highest priority task
	  to be scheduled in, starting from the point it has woken up.

109 110
config CONTEXT_SWITCH_TRACER
	bool "Trace process context switches"
111
	depends on HAVE_FTRACE
112
	depends on DEBUG_KERNEL
113 114 115 116 117 118
	select TRACING
	select MARKERS
	help
	  This tracer gets called from the context switch and records
	  all switching of tasks.

S
Steven Rostedt 已提交
119 120 121
config STACK_TRACER
	bool "Trace max stack"
	depends on HAVE_FTRACE
122
	depends on DEBUG_KERNEL
S
Steven Rostedt 已提交
123 124 125 126 127 128
	select FTRACE
	select STACKTRACE
	help
	  This tracer records the max stack of the kernel, and displays
	  it in debugfs/tracing/stack_trace

129 130 131
config DYNAMIC_FTRACE
	bool "enable/disable ftrace tracepoints dynamically"
	depends on FTRACE
132
	depends on HAVE_DYNAMIC_FTRACE
133
	depends on DEBUG_KERNEL
134 135 136 137 138 139 140 141 142 143 144 145 146 147
	default y
	help
         This option will modify all the calls to ftrace dynamically
	 (will patch them out of the binary image and replaces them
	 with a No-Op instruction) as they are called. A table is
	 created to dynamically enable them again.

	 This way a CONFIG_FTRACE kernel is slightly larger, but otherwise
	 has native performance as long as no tracing is active.

	 The changes to the code are done by a kernel thread that
	 wakes up once a second and checks to see if any ftrace calls
	 were made. If so, it runs stop_machine (stops all CPUS)
	 and modifies the code to jump over the call to ftrace.
S
Steven Rostedt 已提交
148

149 150 151 152 153
config FTRACE_MCOUNT_RECORD
	def_bool y
	depends on DYNAMIC_FTRACE
	depends on HAVE_FTRACE_MCOUNT_RECORD

S
Steven Rostedt 已提交
154 155 156 157 158 159
config FTRACE_SELFTEST
	bool

config FTRACE_STARTUP_TEST
	bool "Perform a startup test on ftrace"
	depends on TRACING
160
	depends on DEBUG_KERNEL
S
Steven Rostedt 已提交
161 162 163 164 165 166
	select FTRACE_SELFTEST
	help
	  This option performs a series of startup tests on ftrace. On bootup
	  a series of tests are made to verify that the tracer is
	  functioning properly. It will do tests on all the configured
	  tracers of ftrace.